16
 If the heart is the body’s “pump,” then the “plumbing” is the system of arteries, veins, and capillaries.  Arteries carry blood away from the heart.  Veins carry blood toward the heart.  Capillaries allow for exchange between the bloodstream and tissue cells.

19
20-19  Blood flow: amount of blood flowing through a tissue in a given time (ml/min)  Perfusion: rate of blood flow per given mass of tissue (ml/min/g)  Important for delivery of nutrients and oxygen, and removal of metabolic wastes  Hemodynamics  physical principles of blood flow based on pressure and resistance